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#[macro_use]
pub mod approx_eq {
#[macro_export]
macro_rules! assert_approx_eq {
($x: expr, $y: expr) => {
let eps = 1e-6;
let (x, y): (f64, f64) = ($x, $y);
assert!(&x.signum() == &y.signum());
let (x, y): (f64, f64) = (x.abs(), y.abs());
assert!((&x - &y).abs() / [x, y].iter().cloned().fold(f64::NAN, f64::min) < eps);
};
($x: expr, $y: expr, $e: expr) => {
let (x, y): (f64, f64) = ($x, $y);
assert!(&x.signum() == &y.signum());
let (x, y): (f64, f64) = (x.abs(), y.abs());
assert!((&x - &y).abs() / [x, y].iter().cloned().fold(f64::NAN, f64::min) < $e);
};
}
}
#[test]
fn test_noeps() {
assert_approx_eq!(1., 1.);
assert_approx_eq!(1., 1.000001);
}
#[test]
fn test_witheps() {
assert_approx_eq!(1.0000000001, 1., 1e-5);
}
#[test]
#[should_panic(expected = "assertion failed")]
fn test_invalid() {
assert_approx_eq!(1.0000000001, 1., 1e-10);
}
#[test]
#[should_panic(expected = "assertion failed")]
fn test_sign() {
assert_approx_eq!(1., -1.);
}